We consider the equilibrium shapes of a thin, annular strip cut out in an elastic sheet. When a central fold is formed by creasing beyond the elastic limit, the strip has been observed to buckle out-of-plane. Starting from the theory of elastic plates, we derive a Kirchhoff rod model for the folded strip. A non-linear effective constitutive law incorporating the underlying geometrical constrain...

For viable counting, 0.1 ml. volumes of bacterial suspension were incorporated in 1.5-2 ml. nutrient agar, which after mixing was allowed to solidify in an almost horizontal test-tube so as to produce a 3 4 in. agar strip. After incubation in the vertical position, the counts of the strips gave estimates of a bacterial population which did not differ significantly from that obtained from plates...

A simple technique, based on the recently developed elastic strip analysis (ESA)[1] of bi-harmonic equation for moments and deflections simply supported rectangular plates from finite series expression suggested valid displacement function method, is applied to skewed rhombic plates. The formulation uses a characterization load area contributed by shorter diagonal longer obtain fractions in fou...

Flatness is a vital quality index that determines the dimensional accuracy of cold-rolled strip. This paper designs local shape wave extraction algorithm and fuzzy classification for overall flatness defect based on cosine distance. By introducing small displacement buckling theory thin plates, plate stress model waves studied, critical elongation difference under given conditions are obtained....